I love high heels but the highest heels for me is 3 inches. More than that I'll stumble as I feel imbalance. I don't know how some managed to pull off wearing higher than that. Some can even dance while wearing them.
I had 4.5 inch heels for my daughters wedding. They were balanced just right and o so comfortable. I took them off at midnight (after dancing) because clearing the tables was giving me a sore back...I was too tall.